Spring suspension



Jan. 12 1926. K 1,569,670

C. H. PALMER y SPRING SUSPENSION Filed Feb. 29, 1924 FIG. i 1i- Z Luuk-k." "Jig-gu "-5,115

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Patented Jan. l2, 1926.

UNITED STATES CHARLES H. PALMER, OF MILWAUKEE,`WISGONSIN`.

SPRING SUSPENSION.

Application filed February 29, 1924. Serial No. 6,915,946. y v

To all whom t may concern: l

Be. it known that I, CHARLES H.`PALMER a citizen of the United States, and resident of Milwaukee, kin the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Spring Suspensions, of which the following is a description, reference being had to the accompanying drawings, which are a part of this specification. I i p The invention relates to springsuspensions suitable for use in' vehicles.

.An object of the invention is to provide a spring suspension of thespring and lever type which will afford the proper cushioning under both light and heavy loads.

Another objectof the invention is to provide a spring suspension of this type in which the recoil is controlled.

-The invention further consists in the several features hereinafter set forth and more particularly defined by claims at the conclusion hereof.

In the drawings, Fig. 1 is a plan View of a spring suspension constructed in accordance with this invention, parts being broken away and parts being shown in section.

Fig. 2 isa vertical sectional view taken on the line 2 2 of Fig. 1, parts being broken away.

Fig. 3 isa similar View taken on the line 3 3, of Fig. 1 but showing the deflection under load, and

Fig. 4 is a similar View taken on the line 4 4 of Fig. 1.v

In the drawings-,10 indicates a supporting frame on which sets of alined brackets 11 are secured at opposite sides. A loadreceiving frame or platform 12 is provided with bearing brackets 13 secured transversely below the platform at its ends, and a pair of spaced parallel polygonal shafts 14 extend between the bearing brackets and are journalled therein. Arms or levers .15 and 16 are keyed on said shafts at their central and terminal portions respectively and extend outwardly from each shaft adjacent the brackets 11 to which they are connected by shackles 17. A conically coiled compression spring 18 is mounted on ledges 19 within a centrally disposed opening 2O in the platform. The inner ends 21 of the levers extend into the opening 2O and are slotted at their underside to form hooked projections 22. A T-shaped hook bolt 23 has its threaded end 24 extending through the upper opening of the spring and is providedr with a thrust washer 25 lheld in engagement at the upper end of theV spring by an ad Justable nut 26. A pair of shackles 27 connects the hook bolt with the hooked projec- A tions 22 on the inner ends vof the levers 15.

Levers 28 are keyed to the shafts'14 interl' mediate the levers 15 and 16, and are disposed in substantially vertical position. The upper ends of the levers 28 eXtend'into transverse openings 29 in the platform and are` provided with slots 30 to take the hooked ends 31 of a siiubbing spring 32.V The lowerr endsof `the levers 28 are provided with similar slots 33 to take the hooked ends 34 of a supplementary spring 35. The hooked ends of the springs 32 and 35 are permitte'da limitedplay inthe slots 30 and y33, which eX- i tend in a longitudinal direction with respect Cil to 'the springs and thusaord lost motion connections which allow some outward Inovement ofcorresponding ends of the'leve'rs 2 8 before the springs are placedunder tension kby the further movement of the levers. y i

Thus it will be seen that the platform 12 is resiliently mounted onthe frame 10 byk the shackled arms 15 and 16 keyed on the shafts 1-1` which are under the influence of' theconicalY spring 18, the. supplementary springs 35 and the snubbiiig springs 32. The presence of a light load on the platform will deflect the central spring alone, the supplementary springs '35 being inactive by'reason of their lostl motion connectionsv with the levers 28. j

' When a heavier load is imposed,producing the deflection seenin Fig. 3, the spring 35 will come into action to producethe added stiffness desirable for carrying-such load, whereas kunder va light load it is desirable to have the more,` sensitive spring action afforded by the central spring 18 acting alone. The nut 26 on the hook bolty 23 may be adjusted to produce any desired initial deflection of the spring 18.

The snubbing springs 32 remain normally inactive by reason of their lost motion connections with the upper ends of the levers 28 but come intoy action on the recoil before the central spring has exhausted itself to gradually decelerate the upward movement of the load-receiving frame with respect to the supporting frame.

I desire it to bey understood that this inventioii is not limited to any specific foi-ni or 'arrangement of parts except in so far as` such limitations are specified in the claims.

What I claim as new and desire to secure by Letters Patent is:

l. In a spring suspension, the combination with a supporting frame, of` a'loadreceiving frame having a pair of spaced parallel shafts rotatably mounted thereon, arms fixed to said lshafts and having their outerlends pivotally connected `to said supporting frame at opposite sides, a spring mounted on said load-receiving frame and operatively connected to said shafts to yieldingly restrain their rotation under load, and` a second spring supported from said shafts and operatively connected thereto to yieldingly restrain the rotation of `said shafts in adirection opposite to that produced by an impressed load, whereby said last-named `spring becomes effective on the recoil of the first-named spring to decelern ate the upward movement of said load-receiving frame.

2. In a spring suspension, the combination with a supporting' frame, of a load-ie ceiving frame having a pair of spaced parallel shafts rotatably mounted thereon, arms fixed rto saidshafts and `having their outer ends pivotally. connected to said supporting frame lat opposite sides, a spring mounted oiisaid load-receiving frame and operatively connected to said shafts to yeldingly restrain their rotation under load, a pair of arms fixed to said shafts and extending therefrom at anangle to a common axial plane through said shafts to have their free ends move apart on the upward, movement of said loadreceiving frame, and a `tension. springcoiinecting the free ends of the last-named arms, wherebysaid spring becomes effective on the recoil of the first-named spring tol decelerate the upward movement of said loadreceiving frame.

3. In a spring suspension, the combination Vwith a supportingframe, of a load-receiving framelhaving a pair of spaced para-L lel nshafts rotatablymouiited thereon, arms fixed Ito said vshafts and having theirouter endsfpivotally connected to opposite sides of saidsupporting frame, a spring mounted on said load-receiving frame and operatively connected to said shafts to yieldingly rcstrain their rotation under load, a pair of springs operatively connected to said shafts to yieldingly restrain their rotation in opposite directions, means whereby one of said springs becomes effective after a predetermined defiection of said first-named spring,

` and means whereby the other of said springs iiigly restrain the downward movement of said loadsreceiving frame, a` pair of tension to yieldingly restrain their rotation in opposite directions, and lostmotion connections i whereby one of said springsbecomes effecsprings operatively connected to said `shaftstive after a predetermined-defiectionof said f Erst-named spring and the other of said said first-named spring.

5. In a springsuspension, the combination with a supporting frame, of a load-resprings becomes effective on `the recoil off ceiving frame having a pair of spaced parall lel shafts rotatably mounted thereon, arms fixed to said shafts and having their outer ends pivotally connected to opposite sides i of said supporting frame, a compressions spring mounted on said `loadreceivingir frame and operatively connected' `tosaid shafts to yieldingly restrain the downward 2- movement of said load-receivingframe,a pair of levers fixed to said shafts and `extending transversely of a common axial plane therethrough, a spring connecting the lower ends of said levers and effective to yieldingly restrain rotation of said shafts` after a predetermined defiection of said iirst-namedspring, and a second spring conneet-ing to the upper ends of said levers and effective to control the recoil of said first named spring,

In testimony whereof I affix mysignature.

CHARLES H. PALMER. 

